Volume 40, Number 1, February 2022
|158 - 166
|02 May 2022
Effects of air properties on flow filed characteristics of inflatable reentry decelerator
Beijing Institute of Space Mechanics & Electricity, Beijing 100094, China
2 Laboratory of Aerospace Entry, Descent and Landing Technology, CASC, Beijing 100094, China
Air properties are very important for predicting the flow filed characteristics of aircraft. At present, Sutherland formula is always used to predict the flow filed characteristics of inflatable reentry decelerator. However, high temperature can be observed in high speed reentry flow around inflatable reentry decelerator, thus the Sutherland formula is not suitable for reentry flow simulation of inflatable reentry decelerator. In order to investigate the effect of the air properties on the flow filed characteristics of inflatable reentry decelerator, and provides the theoretical references for the inflatable reentry decelerator design, the Gupta fitting formula and Sutherland formula are used to describe the air properties, respectively, for studying the flow filed characteristics of inflatable reentry decelerator. The results show that the reentry flow temperature with Gupta fitting formula used is lower than that with Sutherland formula used, and the temperature difference is more obvious in the high inflow Mach number and temperature cases. The results in the windward of inflatable reentry decelerator show that the Sutherland formula underestimates the heat flux and pressure, and the heat flux difference is much more obvious. Such as case 5, the peak heat flux obtained by Gupta fitting formula is by 29% higher than that obtained by Sutherland formula.
空气物性参数对于飞行器再入流场特性的预测十分重要, 目前对充气式返回舱流场特性的预测常采用Sutherland公式, 而充气式返回舱高速再入流场温度较高, Sutherland公式并不适用。为研究空气物性对充气式返回舱流场特性的影响, 为充气式返回舱的工程设计提供一定理论参考, 分别采用Gupta拟合的高温空气物性参数以及Sutherland公式对充气式返回舱的流场特性进行了数值模拟研究, 比较了两者计算结果的差异。结果表明, 采用Gupta拟合公式获得的流场温度低于Sutherland的计算结果, 且这种差异在高来流马赫数和温度的工况更加明显。对返回舱迎风面的热流密度和压强的研究发现, Sutherland公式低估了迎风面的热流密度和压强, 其中热流密度的低估程度比压强的低估程度更大, 工况5中Gupta拟合公式获得的热流密度峰值高出Sutherland公式获得的热流密度峰值29%。
Key words: air transport properties / Gupta fitting formula / Sutherland formula / inflatable reentry decelerator / simulation
关键字 : 空气物性 / Gupta拟合公式 / Sutherland公式 / 充气式返回舱, 数值模拟 /
© 2022 Journal of Northwestern Polytechnical University. All rights reserved.
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